CVE-2025-37924 ksmbd: fix use-after-free in kerberos authentication
A use-after-free flaw in the Linux kernel's ksmbd module allows attackers to potentially execute code or escalate privileges via Kerberos authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-37924?
CVE-2025-37924 is a critical use after free vulnerability in Debian Debian Linux, published on 20 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix use-after-free in kerberos authentication
Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.
Weakness: CWE-416
Which versions are affected by CVE-2025-37924?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-37924?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-37924 being exploited?
There is no known exploitation of CVE-2025-37924 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2025-37924, DEBIAN-CVE-2025-37924, GHSA-3x67-44wh-mrgf, ROOT-OS-DEBIAN-12-CVE-2025-37924, ROOT-OS-UBUNTU-2204-CVE-2025-37924, ROOT-OS-UBUNTU-2404-CVE-2025-37924 and 1 more.